1. By: Katie Newton Muscles are everywhere!

2. Think about it if you were a skeleton hanging on a string and your string got cut you would simply fall on the ground. The same thing would happen if you had no muscles. You might think that muscles push and pull to do their job of letting you do even the slightest movement of biting down with your teeth. But all there is to it is contracting and relaxing. Tendons are groups of tough fiber that connect muscles to your bones.

3. Voluntary or Involuntary? Voluntary muscles are only skeletal muscles If a muscles voluntary it is under your control Involuntary muscles are smooth muscles or the cardiac muscle An involuntary muscle you do not manually control

4. Three Kinds of Muscles  Skeletal Muscles  Smooth Muscles  Cardiac Muscles

5. Skeletal Muscles Skeletal muscle cells are made when lots of smaller progenitor cells clump together to form long, straight multinucleated fibers. The fibers formed are very strong. Skeletal muscles are the only voluntary muscle tissues in the human body. They are consciously controlled.

6. Smooth muscles Smooth muscles are found in organs such as the stomach, intestines, or blood vessels. They help move substances through an organ by contracting and relaxing. (Visceral muscle)

7. Cardiac Muscle (The Heart) The cardiac muscle is the heart muscle. Its job is to pump blood throughout the body. In many mays it is similar to smooth muscles. It contracts with a great force.

8. Muscles Injuries When your muscles abruptly and automatically contract, but don’t relax, you will feel a cramp. Muscle are connected to the brain by nerve routes. When you overuse a muscle, unusual things occur in this nerve pathway. This prevents the muscle from relaxing. Tears of tendons are very painful. They’re caused from twisting or moving your tendon in a wrong way. They can also be caused by hard impact.

9. Certain Muscles Throughout The Body The Sartorius muscle is the longest muscle in the human body. The stapedius muscle is the smallest, shortest muscle in the body. This muscle softens the sound of your own chewing and your own voice. It is about one- twentieth of an inch.

10. More Special Muscles There are three gluteal muscles and the gluteus maximus is the largest of the three. In fact it is the largest in the body. The diaphragm muscle is one of the very important muscles, it helps with the respiratory system. It is the second hardest working muscle in the body. The cardiac muscle, or the heart, is the hardest working muscle in the body.

11. Muscle Remembrance, Exercise, & Energy When you practice a movement over and over again you acquire muscle memory. This is when you become more trained by practicing an action repetitively. This can occur in sports or music and many other things. The more muscles are exercised, the stronger and more flexible they will become. Although, you can over work a muscle which might lead to soreness. For muscles to contract they must have energy. They use nutrients like fats, carbohydrates and protein.

12. Bibliography  Julia, B. Muscles, Kids Discover ©2007  Frank, Marjorie Slavick, Harcourt Science Copyright © 2000 by Harcourt, Inc. pages A25, R30-31  "Biology for Kids: Muscles in the Human Body." Ducksters. Technological Solutions, Inc. (TSI), Nov. 2013. Web. 6 Nov. 2013. http://www.ducksters.com/science/muscles.php http://www.ducksters.com/science/muscles.php  Taylor, Tim http://www.innerbody.com/image/musfov.htmlhttp://www.innerbody.com/image/musfov.html COPYRIGHT 1999 - 2013 HOWTOMEDIA, INC. Anatomy and Physiology Instructor